84 lines
2.9 KiB
Swift
84 lines
2.9 KiB
Swift
//
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// UIControlPublisher.swift
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// VDS
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//
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// Created by Matt Bruce on 8/18/22.
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//
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import Foundation
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import UIKit
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import Combine
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/// A custom subscription to capture UIControl target events.
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public final class UIControlSubscription<SubscriberType: Subscriber, Control: UIControl>: Subscription where SubscriberType.Input == Control {
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private var subscriber: SubscriberType?
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private let control: Control
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private let event: UIControl.Event
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public init(subscriber: SubscriberType, control: Control, event: UIControl.Event) {
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self.subscriber = subscriber
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self.control = control
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self.event = event
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//allow highlight for VDS.Controls on "onClick" events
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if let c = control as? Clickable, event == .touchUpInside {
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c.touchUpInsideCount += 1
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}
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control.addTarget(self, action: #selector(eventHandler), for: event)
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}
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public func request(_ demand: Subscribers.Demand) {
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// We do nothing here as we only want to send events when they occur.
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// See, for more info: https://developer.apple.com/documentation/combine/subscribers/demand
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}
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public func cancel() {
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subscriber = nil
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}
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deinit {
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//remove highlight for VDS.Controls on "onClick" events
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if let c = control as? Clickable, event == .touchUpInside, c.touchUpInsideCount > 0 {
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c.touchUpInsideCount -= 1
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}
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}
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@objc private func eventHandler() {
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_ = subscriber?.receive(control)
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}
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}
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/// A custom `Publisher` to work with our custom `UIControlSubscription`.
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public struct UIControlPublisher<Control: UIControl>: Publisher {
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public typealias Output = Control
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public typealias Failure = Never
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public let control: Control
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public let controlEvents: UIControl.Event
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public init(control: Control, events: UIControl.Event) {
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self.control = control
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self.controlEvents = events
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}
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/// This function is called to attach the specified `Subscriber` to this `Publisher` by `subscribe(_:)`
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///
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/// - SeeAlso: `subscribe(_:)`
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/// - Parameters:
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/// - subscriber: The subscriber to attach to this `Publisher`.
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/// once attached it can begin to receive values.
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public func receive<S>(subscriber: S) where S : Subscriber, S.Failure == UIControlPublisher.Failure, S.Input == UIControlPublisher.Output {
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subscriber.receive(subscription: UIControlSubscription(subscriber: subscriber, control: control, event: controlEvents))
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}
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}
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/// Extending the `UIControl` types to be able to produce a `UIControl.Event` publisher.
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public protocol CombineCompatible { }
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extension UIControl: CombineCompatible { }
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extension CombineCompatible where Self: UIControl {
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public func publisher(for events: UIControl.Event) -> UIControlPublisher<Self> {
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return UIControlPublisher(control: self, events: events)
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}
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}
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